87145217 has 2 divisors, whose sum is σ = 87145218. Its totient is φ = 87145216.

The previous prime is 87145211. The next prime is 87145231. The reversal of 87145217 is 71254178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69872881 + 17272336 = 8359^2 + 4156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87145217 is a prime.

It is not a weakly prime, because it can be changed into another prime (87145211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43572608 + 43572609.

It is an arithmetic number, because the mean of its divisors is an integer number (43572609).

Almost surely, 2^87145217 is an apocalyptic number.

It is an amenable number.

87145217 is a deficient number, since it is larger than the sum of its proper divisors (1).

87145217 is an equidigital number, since it uses as much as digits as its factorization.

87145217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 87145217 is about 9335.1602557214. The cubic root of 87145217 is about 443.3511628435.

It can be divided in two parts, 8714 and 5217, that added together give a palindrome (13931).

The spelling of 87145217 in words is "eighty-seven million, one hundred forty-five thousand, two hundred seventeen".